//printing section

function checkBlob(){
	print("checkBlob: "+config.blob);
	if (config.blob) {
		clearInterval(config.blobInterval);
		config.a.href = config.window.URL.createObjectURL(config.blob);
		print("HREF: "+config.a.href);
		config.a.download = 'test.pdf';
		config.a.click();
		config.window.URL.revokeObjectURL(config.a.href);
	}
	config.count=config.count+1;
	print("Eval: "+config.count);
	if (config.count>100){
		clearInterval(config.blobInterval);
	}

}

function printForm(){

	config.doc=new PDFDocument();
	//config.doc.end();
	let stream = config.doc.pipe(blobStream()).on("finish",function(){
			config.blob=stream.toBlob("application/pdf");});
	
	print("BLob: "+config.blob);
	config.a = config.document.createElement("a");
	config.document.body.appendChild(config.a);
	config.a.innerHTML="Download PDF";
	config.a.style = "display: none";
	config.count=0;
	//run until blob is set
	config.blobInterval=setInterval(checkBlob,1000);

	//pick data from crfForm list
        print("Printing form");
	printHeader();
	setData(formatPrintData);
}

function printHeader(){
	config.doc.fontSize(25).text(config.formConfig.form['formName']);
	config.doc.moveDown();
	let crfEntry=config.formConfig.crfEntry;
	let site=config.formConfig.currentSite;
	let val=new Object();
	let user=config.formConfig.user;
	val['A']={o:crfEntry,f:'EudraCTNumber',t:'Eudra CT Number'};
	val['B']={o:crfEntry,f:'StudyCoordinator',t:'Study Coordinator'};
	val['C']={o:crfEntry,f:'StudySponsor',t:'Study Sponsor'};
	val['D']={o:site,f:'siteName',t:'Site'};
	val['E']={o:site,f:'sitePhone',t:'Phone'};
	val['F']={o:user,f:'DisplayName',t:'Investigator'};

	for (let f in val){
		print('Printing for '+f);
		let e=val[f];
		let entry=new Object();
		entry[f]=e.o[e.f];
		printPDF(entry,
			{name:f,caption:e.t,type:'string'},null);
	}
	config.doc.moveDown();
}

function formatPrintData(){
	qS=config.formConfig.dataQueries;
	for (let q in qS){
		print('Setting up '+q);
		let qData=qS[q];
		print('Number of rows: '+qData.rows.length);
		if (qData.rows.length>0){
			config.doc.fontSize(20).text(qData.title);
		}
		for (let i=0;i<qData.rows.length;i++){
			let entry=qData.rows[i];
		       	for (let f in qData.fields){
				let field=qData.fields[f];
				let lookup=null;
				if (field.lookup){
					lookup=config.formConfig.lookup[field.lookup.queryName];
				}
				if (field.hidden) continue;
				printPDF(entry,field,lookup);
			}
		}
		config.doc.moveDown();
	}
	print("All done");
	config.doc.end();
}

function printPDF(entry,field,lookup){
	//object field should have a name, type, caption
	//entry should have field.name
	//lookup is null or has a lookup table LUT 
	//for value v of entry[field.name]
	//
	//the total width of a A4 page is 598 px, 
	//left margin is 72. With a right margin of 50,
	//the total available with is 476 px.
	
	let w=476;
	let spacing=25;
	let w1=(w-spacing)*0.5;
	let fontSize=14;	
	
	print('printPDF: entry['+field.name+']='+entry[field.name]);
	let v=entry[field.name];
	if (lookup!=null){
		v=lookup.LUT[v];
	}
	print('printPDF: field type:'+field.type);
	if (field.type=="date"){
		let d=new Date(v);
		v=d.getDate()+'/'+(d.getMonth()+1)+'/'+d.getFullYear();
	}	
	if (v===null) v=' / ';
	if (v===undefined) v=' / ';

	//measure text
	let label=field.caption;
	let opt={width:w1};
	config.doc.fontSize(fontSize);
	
	//for more eloquent display the height of the text
	//can be measured prior to output
	//use currentLineHeight to scale height
	//let lineH=config.doc.currentLineHeight(1);
	//let h=config.doc.heightOfString(label,opt)/lineH;


	//print label
	config.doc.font('Courier').text(label,opt);
	
	//align last row of description w/ first row of value
	config.doc.moveUp();

	//store x value for later use
	let tx=config.doc.x;
	let ty=config.doc.y;

	//shift for value output
	config.doc.x+=w1+spacing;
	
	config.doc.font('Courier-Bold').text(v,opt);

	//restore x value
	config.doc.x=tx;
	
}